Process for producing tarnish-resisting silver and silver plate



Patented Aug. 19, 1930 RICHARD 0. BAILEY, OF ONEIDA, AND WILLIAM S. MURRAY,

.ASSIGNORS TO ONEIDA COMMUNITY, LIMITED, OF ONEIDA, NEW YORK, A

'lION. OF NEW YORK mam or trim, NEW YORK,

conrona- PROCESS FOR PRODUCING TARNISH-BESISTING SILVER AND SILVER PLATE No Drawing.

such coloring treatment with kerosene and lampblack.

Plated articles so treated (and this would be true of solid silver articles) tarnishreadily or quickly and therefore require repeated cleaning and polishing by dealers handling them. 1

r We have discovered that this tendency to tarnish is due to impurities in the kerosene or lamp black used or (stated difierently) that this tendency is very materially diminished by the use, in the coloring operation, of kerosene and lampblack which are free from sulphuror other tarnishing or tarnish-producing elements.

We have also discovered that if a small quantity of an'element of the halogen group (preferably iodine) be added to the kerosene and lamp black mixture free from tarnishing or tarnish-producing elements, the tendency to tarnish is very materially reduced and a silver or silver-plated article is produced which will withstand tarnishin for a much longer time than articles hereto ore; produced by the use of the ordinary kerosene and lamp black mixture. In practicing theinvention, therefore, we

use in the coloring treatment of the silver or silver plate a mixture of kerosene and lamp black which is free fromtarnishing or tarnish-producing elements and to which we add a small amount of iodine, constituting about 1% of the total mixture. This mixture is then applied to the silver surface in the usual manner, that is to say, by the use of a canton flannel or cotton covered bufiing wheel.

The mixture used is preferably prepared set our hands.

Application filed December 14, 1925 Serial No. 75,386.

as follows: The 1% of iodine, by weight, is dissolved in the kerosene and this mixture has added to it enough lampblack to form a paste of suitable consistency for application to and its retention by the canton flannel or cotton covering of the buifing wheel.

\Vhat is claimed is: I

. 1. The process of treating silver and silver plated articles for the purpose of rendering the surface of the article tarnish resistant, which consists in polishing the surface thereof with a mixture of kerosene and lampblack, said mixture being, free from tarnishing or tarnish-producing ingredients.

2. The process of treating silver and silver plated articles for the purpose of rendering the surface of the article tarnish-resistant, which consists in polishing the surfaces thereof with a mixture of kerosene and lampblack, said mixture being free from tarnishing or tarnish-producing ingredients and containing iodine.

In testimony whereof, wehave hereunto 

